NL Notes: Roark, Weeks, Gregorius, Marlins, Mets, Cards

The Nationals’ unheralded acquisition of current fifth starter Tanner Roark represents a “triumph of scouting,” writes Ken Rosenthal of FOX Sports. With the Nats looking to dump the salary of Christian Guzman back in 2010, the team identified the little-known Roark as a potentially useful arm and picked him up along with righty Ryan Tatusko. While Roark was the real prize of that swap, GM Mike Rizzo says that Tatusko (who owns a 2.15 ERA through seven starts at Triple-A) could reach the bigs himself “somehow, somewhere, with somebody.”

Here’s more out of Washington and the rest of the National League:

Much-maligned Brewers second baseman Rickie Weeks has been reasonably productive this year, and could potentially be dealt if Milwaukee can find an interested partner, writes Rosenthal. The 31-year-old, who is earning $11MM this year before he reaches the open market, has a .318/.375/.364 line through just 48 plate appearances. Somewhat curiously, and counter to his career tendencies, the right-handed hitter has been knocking around same-handed hurlers (.954 OPS) while struggling against southpaws (.541) in an approximately even number of appearances against pitchers of both sides. Rosenthal mentions the Cardinals and Orioles as possible matches, though the former seems unlikely with Milwaukee leading the division. (Of course, Baltimore already owns the rights to Weeks’s younger brother, fellow second bagger Jemile Weeks.)

The Diamondbacks are still in no rush to deal shortstop Didi Gregorius, who is spending some time at second while fellow middle infield prospect Nick Ahmed sees time at short. Rosenthal notes that the team is unlikely to field a double-play combination of Gregorius and Chris Owings unless it saw fit to deal keystone stalwart Aaron Hill, who earns $12MM both this year and next.

There is little doubt of the biggest story in baseball right now: the UCL tear of Marlins’ young ace Jose Fernandez. With the club still in the thick of things in the NL East, MLB.com’s Joe Frisaro suggests that Miami should consider a bold move: a trade for Jeff Samardzija of the Cubs. While top prospect Andrew Heaney offers some hope of filling Fernandez’s shoes (to the extent that is possible), Frisaro says that Samardzija “could save the season” for the Fish. Of course, acquiring him could well require parting with Heaney — if not more, if the Cubs’ ace continues his current dominance. Samardzija comes with another year of control after the present, though he’ll be fairly expensive after earning $5.345MM in his second trip through arbitration.

While weighing a call-up of Heaney, if not a more drastic move, the Marlins will promote Anthony DeSclafani for his first big league action, tweets Juan C. Rodriguez of the Sun Sentinel. Baseball America tabbed DeSclafani as the team’s fifth-best prospect coming into the season, saying that the 24-year-old (who came over in the infamous Blue Jays trade) could top out as a number three starter or back-end reliever.

Whatever the intentions of Mets’ co-owner Saul Katz, any sale of his portion of the team’s equity is not likely to change the control of the club, writes Jon Heyman of CBSSports.com. Heyman walks through the reasons that, even if Katz looks to move some or all of his shares, the Wilpon family is quite likely to stay in charge in New York.

Cardinals GM John Mozeliak acknowledges that he finds the club’s middling start “concerning,”reports MLB.com’s Jenifer Langosch. While the team has plenty of internal possibilities to shake things up, Mozeliak says that he does not intend to just go with what he has if the situation warrants change. “I can’t imagine us just doing nothing all season and just say our strategy is you’re going to rise up to your mean,” said Mozeliak, who said the club’s 19-20 record may actually be an over-achievement at this point. “For us, there are some things we want to be sensitive to. The month of July is an opportunity to maybe change the look of your club if you have to. The clock’s ticking, but it’s not in a panic mode or a reactionary place where you have to just do something to do something. I think people have to be aware that this is not acceptable baseball at this point.”